
static void insert_vmap_area(struct vmap_area *va,
                             struct rb_root *root, struct list_head *head)
{
    struct rb_node **link;
    struct rb_node *parent;

    link = find_va_links(va, root, NULL, &parent);
    if (link)
        link_va(va, root, parent, link, head);
}
